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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e984733307b05fcd8cb3e353fd42c2923bf5b4a6315220c3c9f13a62f8ac77' 
  AND token = 'HjICVVyZXQXqzeK8/8qyqQjZKPkXVbxr2mZCXzINKFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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