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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c76670c9a730abf8204e45bfdd4c631d486ec14cba1ed28dd75aef0d2907b3' 
  AND token = '/V+FYwzpKLtvJuwY3prk5ekcSkt8m78mu2a0Qq+5RWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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