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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f177488ffa018c7efc4367cf0aec64e773c44bbfeff5a6a2676318ac723c69e' 
  AND token = 'ymrf348rP7+h3rPqz/N4xIIiO69AvjYdvlJvp0OC6ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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