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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdacc769860adec73ba129f7ed176db4a9a0b67d657613da54d70a9df7a6a73' 
  AND token = '2fz6lIx7CUD/iw/+U7ivvPnLs6JFnLEBIdUAozahkYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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