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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb3107baede8ba58d3bd6bd61a772639b98d79157953c653f50bddf06d8c3065' 
  AND token = 'd2Bh/w9awr3zs+3wUf9WYnCeYl2SSKimoXj68OBERKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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