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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6fe2067daf31220ed91bea8b8047db4d5a21248e1a2c831328ba2f8383de6bf' 
  AND token = 'jLF2qEEJhSfhR+YdwgKUXzt27TzG8e7Gw4hATDpkdgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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