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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a17c3cdc5d7fb80fba02d3f9619956c546efef49b5faa7b70e4cf5b504619c0c' 
  AND token = 'zEQFvbYptDREW+7BY4v0zQgL8mm1y2OU+LKy82juoLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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