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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16bae6fb57e92bba0b30bac496d5bfc0639df1bab25a7b3e1ce6f6c428239239' 
  AND token = 'cd+sR5mrdRfzpgqwcR2Qvj3T38I6eO7hsb2/u9OYBFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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