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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e52fbc6807c6db71829c1056399b400013b9bccf29ce8f7ef0a5d0d0f3a7ec' 
  AND token = 'L2ZYII3+3Tv2UHMafaDAiIIPTZDPp191cmioIQUTSN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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