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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aace8690c2bd5adacda438a3ab0e585f03afa3987bcb4c5642dc1d5d30dc7020' 
  AND token = '400K9R+gjfhe+nn4Efmy7W4lOoFIaLXkInci+CHPLpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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