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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b46160c8980c5c553eab7ab303ef11242f18d05607e339d3609de8117c2426' 
  AND token = 'M5v4uyZQNxQM5BaXC+PSQx40jvWwEsbcRMP6vUZdaOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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