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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'beb805e23da76646b48025064ca1d881e5e7c16ac9138e5aad3e8e7b582015f5' 
  AND token = 'lq0mqZLNtG/QKJgHEJtJIl911GQ//KCP3LeeXvwgEYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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