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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e61b684bafdd28278286899109985f6ece77035b8e5accd9598ba0be69f4a10' 
  AND token = 'i/brMrA4dqvceXrNXNY7T0z+qj7zu+/BbRvfJ4bdIGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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