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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3640f09b146bcbcc3c1961ee14764f5ae674e6a1d896f2f0e60e20adf4459330' 
  AND token = 'po/0Fl4jZzqakNQDMJuyRlpcbjn594v05uxKeM8uns8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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