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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6ed75e9fbdc582148fa803cef7d9c4e9f952e0007d5e7e4454cb105cd4bf2b' 
  AND token = 'JMVhbwJ0iZSGVfv/K5DNbOdD2xtzQNRiEdMfdslo1DA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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