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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71c7bf37d28bbd6444617b1d8af4b683ea0a0a45d8807f1515e7779875a9148e' 
  AND token = 'xtl7Ndh0heEz6uwL8szJTLyRC2aOvOFTmxUxJWHAuyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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