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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5640ec73ef8083b1b7433d3e7fb1ac3522abd959c75ce8b7da9a4ea466a38e' 
  AND token = 'I2PpyZJRMPZq+xaBV6LQ1jBNDANqt1o01hrWe1OaKQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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