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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cfe3f96e0159ad541e91fb6d07257089ece307e0b702a0bd1132ace2c8ec758' 
  AND token = 'LYIsPEICk4yXx5M5dtjT2tFsCCaMPEOXstYW6obBZxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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