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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f44db767b943f50365b0313fe2673af76edf561893a88a4a7958f163f02edfd' 
  AND token = 't30p5C0rNJ6OJiKXIGCCG8mnjXGl+QZP7C/6F6IRvQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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