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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b2885d12523972fbff941202271e45f96349beb2acc21938ca2fabf9a2efd5' 
  AND token = '+F+LWfw7OS26ZUD0bTuIJQKjsg35PB2a+flQmYkbBqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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