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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fb1c4a41e32aea083b98695db0748fb5faa0481315f51354fcfcc145f4f90b' 
  AND token = 'OFzpoDyFgJXn5YfJ1ppZLQ7D2X9MZqxOgfBeHGs9U88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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