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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81bff0072805f901d116d13c9f28499a82137669d38a5b7304cdf83eec0eab3b' 
  AND token = 'S9L7HtB9tgdHv2qcm8jLhK70F3P7RhJJ3j5ERJ2p+yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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