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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155a577152fbd58d510ebcd325b65dc97e6ce379295a13d3e11800fdc6cfdac3' 
  AND token = 'h1dBojiCMe6RjTR63ETOoNCHx/srTmehIckWBKy1UoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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