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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c2313577d28bd1b0bb5d1655e33ae093b5e54f65296813743a3cbd0702ec40' 
  AND token = 'nGCMMRTRe9PFE4Y04A4YViLBN1DHzZIwxsgDMZl3Pv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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