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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a4917acb31d400ba18ec3da09b9826474f757ef9870366826217ff4201070b' 
  AND token = 'R0jLkj/QC/J+XtTP7tzi1nStXBo1lIMWiTd57Bei2dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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