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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb9c63e0ce459b9c89f674456c0664b76091fa9c872cfec94c28584e76d488a3' 
  AND token = 'dUsGeMTb9oWoOs0B83L+Mu3GkA/dY4GJp0s5l0kQqWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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