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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f327b67bf5551a42d913423dbe02cc64cec3e755d0f4ac8bd1e9017c919a04a' 
  AND token = '44NggsxPftGDRMWkHJlctwRSyqxnEUtO15U1t129skA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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