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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c8cb0f579b69a6e62fbbb73c94f313ae1e0dfbe7f75daf7eb852ef6e3a99ab1' 
  AND token = 'L1LvEba4GZA2UPa3lqDYBvdK7O5Du+AsIGKa0gZiNVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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