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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff9b0aa98092617f3b81353ecf6eaa8bcf3808ca15a5a9de599413d895aba60c' 
  AND token = 'O6TctjFK8KYY2i9/krnzAPuFkd40mhHGidFKBOyuN4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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