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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73c23752508cbc84d652f9af492b5cbf87fee8b56c02ed28a0eb08488ba5c44' 
  AND token = 'qiIOH+eEjECog+Vep7HgS4FU1tLLwBlZR4hyTaSEjk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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