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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9304b7b9ea10b7fdd20a4d6a1414d51bfa49478c21dde0d35590e499de080e67' 
  AND token = '3vBb2aLSGehtvyVeCaSYJZbkD2vLiux8llChzjrP12U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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