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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0431e37199e96f548babbaee456d6f44c9692a3bfd33ef5141bc07365a8a433' 
  AND token = '39TZ9nSYkSXor1HUbEWBoDxxpuov0eLB334S5aE5MKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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