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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e67a28e53b1ed9bb687e5488be99b55d2dab1feb5c2ba38f8cbab840692ef3fa' 
  AND token = 'mlKAgJgG9dqzT02FAGYzKoZK5GfZdqzUSDydjrP2Ayo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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