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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '869bcbec361828a465614862361e97337688573e663de8a0f914c953fc6d5b51' 
  AND token = 'm7221MaUvZSTVXp6g83muUqubstSUGT1Soxec6P8W3g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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