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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '257fff3a379bbccdea7b7f33301a048aa23e6877b6fbf5d99073a9414b04ec0c' 
  AND token = 'pVyIAFFFcKFRCOfEZohnngCtZ7szf5jCrcrawR0QPjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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