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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2d70e88eb21a9d8da60b0df7d335a7c3a892b4be1e841f1230216e39880a7c4' 
  AND token = 'idacUBybBNr7zZuiqWpi+6ozp8VxhaXT3ZROdyFPOX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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