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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bef23760d5bf0eb8cbef5e085b8162233133f092f57a79be49f51c1315c7b67' 
  AND token = 'Kk6OBawBg9f6OpX9/yLsw3NxSVBU83EHug3adVo4jz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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