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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab5619fb0c0b38e5279128d4ff53b5fc2b72f0b6dd4d8e200cd840a1eb2c025d' 
  AND token = 'utHvBSis5ZmuNZkMseWbC3dy44fxzsw0n7bVmskKxGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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