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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe40e7c13ecd74f4dc9694775faa3dfcfc1d89969977ba24b26bdf916ff694c' 
  AND token = 'CcD0wC3K7zLEwLmmf+vk2R1rjolQbXo12QBn79AkpzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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