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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83f1389da7d412e6379042d755e0f1d685c06d8ef4b67c7ce1cb1e3706a6261' 
  AND token = 'PuX3X6596CjftcRcqXrxcHLQStZH3XNnphW7m9pqIR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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