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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d0b7318fe61159206592c14373027053f471c9a8473cc0ff655cde3605327bf' 
  AND token = '97o6SYqEuNH81yLx0ZjJitbw9OLY5DwBOsH4pJUNf8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}