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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69c6c43853cfe73c1ca168177f21f7e56681c4c112d904fac4c5a779eb50fe0' 
  AND token = 'bBVap0g5GbNABsrleaA5lqaZit5GLQVJKV5gtH/2RhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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