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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c852099b98a615693e1024b4c4578cf2c68f7bf83078c337e6fe8a9c7920876d' 
  AND token = 'T5Vj2ika0Iv59y4T6p5o4GzbPQdzeix3+FcOCA6cj/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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