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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e31cce795e2b67e00462a69dde0a73f11c557213b3a24dadcb648f6c1663af56' 
  AND token = 'Fqvp+aGOWBG8Jc9KEpy9vOdhjR5wghdE28NxtO1tERM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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