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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ef0f25c2dec332da8b3a7c7e971cf2cadc4b20282e04277fd07cf4609a9b4ed' 
  AND token = '7Gooe+ZhXK/1xPpaZWW/UzorTLTSviZnZIu8enFjSgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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