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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e6e69d0f00ae1af9c5141a17fa67553c6adc6e436c6ee5e5a6b0ad5d1e76d' 
  AND token = 'CK7LN6VhHo/g3MT0Ufa6K+4P0/kn+beDdZ4BFXUR+Xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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