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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7075f6519446d2e992b4cbd013790db4fd74b5f173181aff4ac7ee5d7259d12b' 
  AND token = 'evdKydNOet7+hLycI78Uy/7YvzpQeUdWr2t5G1oWEIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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