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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf55439df4accf470eb1cb03c9f58e5559fe7818a82ac341db957499db145749' 
  AND token = 'IFII7VTNxFreKUSq1dM38Ah80QJOInWWP9GdiWCbVqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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