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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0052622039eadde0d426bfb7614161acd0bbcb7408016fa50da5d16f63e60917' 
  AND token = 'wCuIH3hfpO3K0j2XRNjbZqc6xoJfMpZW75FbInlfXzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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