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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb0d5f8e5d92acf7496f3696c34c912eed1ff4b4bed8a0d5cd19f01254788a7' 
  AND token = '7HRPD6yH8+bC6pehIo+0ZSEo4Dmsg6tZK7+1uroVKS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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