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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ebe622ba6bdfb29999a422e31d19c81780accae7e1d5ac26fe44279e3e415b' 
  AND token = 'kzc9y0d0hps4ifGimIvST6OO6DVNDMnwc8i6gDJS2uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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