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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7212c6294a7334fdb434cfd57f40cc830d5f6f45dab6bd1a774c291c17ad4adf' 
  AND token = 'LRskn3py5N2Bng0+iLb9TJSmFspYQ56MgkzivVrdp5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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