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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '339cf770d3b77ecc7d7f6462274397db098d637fde1d3aa9af092fd3f53c0ad1' 
  AND token = 'N9m3cCZXwT+dtT9FrO/d2wbMBwMh8dibcvpukuUAld0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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