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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0b500ad6a518bac5a01371738d8dd6eefc470e2a097f0a2b759a564f9a6d55' 
  AND token = '6ghuaFNvu+dVB9T2v+SIdYh08l0j34bEByHKNoagJPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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