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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e21311b6b2b383d4f47f16438722b07a3fc2db9742e9339afa4d660d798a99ed' 
  AND token = 'Yr/aTLRLQ5qqlscv5Ft3k5TU1Wt1OYndc5LMIKlzzjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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