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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade8b4d23484c51476209d80c0aca945ce2e7b0f67324e9cd2f6471cb4c40fa7' 
  AND token = 'dx8bTHWNDkitSqSxyix0msp1iTniViO2gAGJ2toe2b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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