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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cd68e22c6a4a8fd506515bba42b24b50d949c932196e7da9a58aa7d899f30c' 
  AND token = 'xlb0KhJaJ5vsCMxP/WK5/K0cyZs5aNdyYl+nvolm8Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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