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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e61d7768001e27f2321028f0b2add9f742e3b50b4d50241c98ea79a6ffb2e9' 
  AND token = 'cVc7GijTODASJvs8KEn+Ocqpbvio68DkKZMxfjhOGM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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